Traveling-grate stoker.



No,857,0l1. PATENTEDJUNE 18, 1907. J. E. BELL. TRVELING GRATE STOKER.

APPLIOATION FILED Nov.21,19o4.

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mk@ Q Uifllf'llED STATES PATENT OFFICE.

JOHN E. BELL, Oli BARBERTON, OlllO, ASSIGNOR TO 'll'lll BABCOCK & WIL- COX C(')l\lPA.\Y, OFINICW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TRAvELiNG-GHATE STOKER.

Specification of Letters Patentil Patented June 18, 1907.

Application ilod 'i'oveiiibcr 21,1904. Serial No. 233,600.

Be it. known that l, J'oiiiv lC. Bini., ol'Barbertoii, Summit county, Ohio, have invented a new and useful 'lTra-veling-tirate Stoker, of which the following is a full, clear, and exact description, reti-rence being had to the ae,-

i-.omj'ianivii'ig drawings, forming part of 4this specilication, in. which liigure l is aside elevation of mvimproved io stoker with Darts ol' the furnace removed;

Fig, 2 is a cross-section on the line lli-lil of Fig. l; Figs. il and 4 are detail views showing the connection between the chain and gratebar; Fig. 5 is a detail view of one of the i5 Scrapers; and vFig. (i shows a modified form of slack adjust ci'.

M v invent ion relates to the class of traveling chain grates, and it is designed to provide an improved construction which will hold the gratehars in' the desired position and .prevent their sagging,` also to provide for easjy removal and repairs, and to avoid friction and binding.

lfn the drawings, l

show grate-bars 2 having end lips or ears 3, which are removiiblv bolted to outwardtiY projecting lugs 4 on the inner links 5 of traveling roller bearing chains having plain outer links 5. The inner links 5 are of the form shown in Figs. 3 and 4, their end edges being inwardly inclined and the links overlapping at their lower ends. Thesel links are connected at tlieiroverlapping lower ends by pins (S carrying ythe rollers 7 and extending through the outer links 5': The chain is provided with a T foreach phi, these rollers resting upon roller upper and lower longitudinal tracks is, tu" which l have shown as of angle-bar form and secured to the side-frame l), U-shaped frames or trai-lis It) e.\tend from the inner ends of the upper tracks to the lower vt racks which are lowered sullicientlj' toallow the rolle "T to rest upon and travel over them. 'lhe l'ifoni ends of the chains extend over sprockei*wheels ll nionnted upon a shaft l2 carried iii lixed bearings lli mounted in the exteiiiinl fixed portion of the side frame the teeth ol said wheel being shaped to receive the chain rollers. i

'l`he supporting side-frames t) of the grate maj be either made separate from or secured direct-ljto the grate-front lll external to the furnace. l have shown them as separate from the front and being slotted (as shown at 14in dotl teillinesiinltig. lland supported by the bearings on the main driving shaft` The side frames can then be adj usted with reference to the lixed driving shaft 13 by the threaded thus taken up. shown a bar or frame b v a pin l 15 in the lixeil cheek front end of the frames and slack in the chain lirtliis construction, l have link 15L connected to the side 5h extending through a slot lil within which the t) extend. This bar bolts l5,

orlink l5fL has alug l5dwhich forms a nut for the screw `l 5, and the latter has a thrust bearing at l .i against the lixed bracket l5".

'lhis arrangement is duplicated for each of the side f rames tl.

.lnstead ol forcing back the movable side frames with reference 9o the main shaft, bj' the threaded bolts at the lronl, l ma v take up the slack b v making the rear curved frames l() adjustable.

the fram tending by operated of the stoker.

'l`hus in Fig. (i l show es l() as movable upon guides exfroin the side frames, and adjustable the screws l5'. 'lliesc screws nia v hc by a rod extending from the lront On account ol the continuous ers prevent their sagging. removing with.

The de 'lhe means lor slack may therefore be dispensed ptli of the coal fed in is regulated b v an adjustable gate lti having a lirebrick lining, this being adjusted vertically by the screw 17 as shown.

The ch aiiis maj be driven b v anj' suitable connections.

l have shown the side frames which are connected'by the transverse angle braces 1N as supported near their rear ends on rollers ltl.

'lliesc rollers enable the movable side frames to be adjusted bj' the front threaded bolts.' l

so that tl may also mount the front portion i of the stoker on rollers 2t) as shown in Fig. l'.

iesc in combination with the rollerslt) will allow the entire machine to be moved out or from under the boiler on a trac-k.

ain and runway are preferabl)l covered b v cast overhanging plates 2l in the side. Wall dirt, ash

s of the furnace.

l tlius prevent or coal from sifting through the links and acc'uimila'ting on the runwa v. l

also preferably provide a scraper for clearin the tracks or runway, this being shown at 22 in rig. 5.

'lliis scraper consists of an angled IOO ' rollers of the chain and scrapes oil or deiiects the dust or dirt accumulating on the runway.

The advantages of my invention result from supporting the grate-bars at both ends throughout their travel. `There is no danger of sagging of the chain, and the friction is reduced to a minimum. The grate may be o erated with the chains slack, and hence tie driving ower may be reduced. The opening of t e links due to sagging 4is prevented and the friction reduced. Any form ot grate-'bar may be used with as little or as much air space as desired. The gratebars may also be easily removed and re aired. A further advantage results from t e manner in which the chains are constructed. Both the inner and outer links of each chain are of such form that they can be easily, stamped and shapedt from plate steeh Heretofore, the links havev been of such shape as to nnecessitate their being cast or forged. Cast links lack the necessary strength, and forged links are too expensive. 'By the simple provision of bending over the upper portions of the inner links, a secure' seat is formed for the ends of the grate bars, no fitting of the parts being required. The inner and outer links being separately formed, any defective meniber can be readily removed and replaced. The flat, higher, inner links also largely protect the rest of the chain, and the rollers and run-way, from heat.

S rocket wheels may be employed at the bac end of the grate instead of the curved runways; and many other variations may be made in the form and arrangement of the chain, the grate-bars, &c., without departing fromV my invention.

I claim A1. In a traveling grate, a pair of chains .consisting each of inner andouter links, rollers jonrnaled between" the links of each chain, and grate-bars secured to the inner links of the chain; substantially as described.

2. In a traveling grate, a pair of chains, consisting each of inner and outer links, pins connecting the inner and outer links oi. each chain, rollers journaled on the ins between the links, and grate bars secure to the inner nkto form supports for the ends of theA grate bars substantially as described.

5. In a traveling grate, a pair of chains composed each of se arable inner and outer links, rollers journaled between the links, and continuous run-ways for the rollers, the inner links of each chain having horizontal portions which extend toward the outer links which form seats for the grate bars; substantially as described.

6. In a traveling grate, a pair of chains, a series of transverse grate bars secured to and connecting the chains, rollers carried by each chain, and continuous run-ways for the rollers having curved end portions at least one of which is separate from, l'and adjustable with respect to, the other portions of the runway; substantially as described.'

In testimony whereof, have hereunto set my hand.

JOHN E. BELL.

Witnesses MARY E. IIAMLIN, G. T. Kurs. 

